A blog (a portmanteau of web log) is a website where entries are written in chronological order and displayed in reverse chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog.

Blogs provide commentary or news on a particular subject such as food, politics, or local news; some function as more personal online diaries. A typical blog combines text, images, and links to other blogs, web pages, and other media related to its topic. The ability for readers to leave comments in an interactive format is an important part of many blogs. Most blogs are primarily textual, although some focus on art (artlog), photographs (photoblog), sketchblog, videos (vlog), music (MP3 blog), audio (podcasting) or sexual in nature (Adult blog), and are part of a wider network of social media.

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Blog software
Blogger
Blogger's Code of Conduct
Blogskin
BROG - (We)blog Research on Genre project
Citizen journalism
Collaborative blog
Corporate blog
Customer engagement
Dream blog
Edublog
Google bomb
List of blogging terms
Blog search engines
List of social networking websites - includes many blog and journal sites
Massively distributed collaboration
Online diary - the precursor to blogs
Political blog
Project blog